Size Available: "W" Design: RW,EW,AW,BW,NW,HW,PW,SW,UW,ZW/HWT,PWT Metric Series: 46,56,66,76,86,101,116,131,146 "X We also can produce various sizes of casing tubes.Size Available:"W" Design: RW,EW,AW,BW,NW,HW,PW,SW,UW,ZW/HWT,PWTMetric Series: 46,56,66,76,86,101,116,131,146"X" Design: RX,EX,AX,BX,NX,HX,PX,SX,UX,ZXAll Chinese Sizes Casing pipe